package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.SetmealDTO;
import com.sky.dto.SetmealPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.SetmealDish;
import com.sky.exception.SetmealEnableFailedException;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.SetmealService;
import com.sky.vo.DishItemVO;
import com.sky.vo.SetmealVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;

@Service
@Slf4j
public class SetmealServiceImpl implements SetmealService {

    @Autowired
    private SetmealMapper setmealMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private DishMapper dishMapper;
    /**
     * 分页查询套餐信息
     * @param setmealPageQueryDTO
     * @return
     */
    public PageResult page(SetmealPageQueryDTO setmealPageQueryDTO) {
        PageHelper.startPage(setmealPageQueryDTO.getPage(), setmealPageQueryDTO.getPageSize());
        // 调用 mapper 层方法查询套餐信息
        Page<SetmealVO> page = setmealMapper.pageQuery(setmealPageQueryDTO);
        // 封装分页结果
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 新增套餐信息,同时需要保存套餐和菜品的关联关系
     * @param setmealDTO
     */
    @Transactional
    public void saveWithDishes(SetmealDTO setmealDTO) {
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);
        //向套餐表插入数据
        setmealMapper.insert(setmeal);

        //获取生成的套餐id
        Long setmealId = setmeal.getId();

        List<SetmealDish>setmealDishes = setmealDTO.getSetmealDishes();
        setmealDishes.forEach(setmealDish -> {
            setmealDish.setSetmealId(setmealId);
        });
        //保存套餐和菜品的关联关系
        setmealDishMapper.insertBatch(setmealDishes);
    }

    /**
     * 删除套餐
     * @param ids
     */
    public void delete(List<Long> ids) {
        //启售的套餐不能删除
        ids.forEach(id -> {
            Setmeal setmeal = setmealMapper.getById(id);
            if (setmeal.getStatus() == 1) {
                throw new RuntimeException(MessageConstant.SETMEAL_ON_SALE);
            }
        });
        //删除后要更新菜品和套餐的关联关系
        ids.forEach(setmealId -> {
            //删除套餐表中的数据
            setmealMapper.deleteById(setmealId);
            //删除套餐菜品关系表中的数据
            setmealDishMapper.deleteBySetmealId(setmealId);
        });

    }

    /**
     * 更新套餐信息
     * @param setmealDTO
     */
    @Transactional
    public void udpate(SetmealDTO setmealDTO) {
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);
        //1.修改套餐表,执行update操作
        setmealMapper.update(setmeal);
        //套餐id
        Long setmealId = setmealDTO.getId();

        //2.删除套餐和菜品的关联关系,操作setmeal_dish表,执行delete
        setmealDishMapper.deleteBySetmealId(setmealId);
        //3.重新插入套餐和菜品的关联关系,操作setmeal_dish表,执行insertBatch
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        setmealDishes.forEach(setmealDish -> {
            setmealDish.setSetmealId(setmealId);
        });
        setmealDishMapper.insertBatch(setmealDishes);
    }

    /**
     * 根据id查询套餐信息
     * @param id
     * @return
     */
    public SetmealVO getById(Long id) {
        SetmealVO setmealVO = new SetmealVO();
        Setmeal setmeal = setmealMapper.getById(id);
        BeanUtils.copyProperties(setmeal, setmealVO);
        //根据套餐id查询菜品信息
        List<SetmealDish> setmealDishes = setmealDishMapper.getBySetmealId(id);
        setmealVO.setSetmealDishes(setmealDishes);
        return setmealVO;
    }

    /**
     * 上架或下架套餐
     * @param status
     * @param id
     */
    public void startOrStop(Integer status, Long id) {
        /*
        学习这个逻辑:
       套餐就算停售,菜品也不会停售 但是如果有菜品停售就无法卖这个套餐 理解业务
         */

       //起售套餐时,判断套餐内是否有停售的菜品,,有停售菜品则提示,套餐内包含为起售菜品,无法起售
        if(status == StatusConstant.ENABLE){
            //select a.* from dish a left join setmeal_dish b on a.id = b.dish_id where b.setmeal_id = id and b.status = 0;
            List<Dish>dishList = dishMapper.getBySetmealId(id);
            if(dishList!= null && dishList.size() > 0){
                dishList.forEach(dish -> {
                    if(dish.getStatus() == StatusConstant.DISABLE){
                        throw new SetmealEnableFailedException(MessageConstant.SETMEAL_ENABLE_FAILED);
                    }
                });
            }

        }
        Setmeal setmeal = Setmeal.builder().id(id).status(status).build();
        setmealMapper.update(setmeal);

    }

    /**
     * 条件查询
     * @param setmeal
     * @return
     */
    public List<Setmeal> list(Setmeal setmeal) {
        List<Setmeal> list = setmealMapper.list(setmeal);
        return list;
    }


    /**
     * 根据id查询菜品选项
     * @param id
     * @return
     */
    public List<DishItemVO> getDishItemById(Long id) {
        return setmealMapper.getDishItemBySetmealId(id);
    }
}
